Heating appaeatus



E. SIEVART. HEATING APPARATUS. APPLICATION men MAR. 29. I919.

Patented Aug". 17, 1920.

ATTORNEY- f r w m M @WV 1,] p 4.} ll firm 7 j T G I m .V H w w UNITEDs'rArgs EDWARD SIEVART, 0F MANITOWOC, WISCONSIN.

HEATING APPARATUS.

Specification of Letters Patent.

Patented Aug. 17, 1920.

Application filed March 29, 1919. Serial No. 286,205.

To all whom it may concern:

Be it known that I, EDWARD SIEVART, a citizen of the United States, andresident of Manitowoc, in the county of Manitowoc and State ofWisconsin, have invented certain new and useful Improvements in HeatingApparatus; and I do hereby declare that the following is a full, clear,and exact descri tion thereof.

l y present invention has reference to new and useful improvements inhot air heaters, particularly to those which form units adapted for usein connection with furnaces and stoves of ordinary construction whichare already in operation.

It is well known that in all furnaces and stoves of typical design thatmore or less heat is wasted by allowing the hot gases to pass up thechimney before the major part of the heat thereof can be extracted. Theobject of this invention, therefore, is to eliminate or reduce to aminimum this heat wastage. In carrying out this object a supplementalheater of unitary design is located between the furnace, stove or thelike and the chimney with which the same is connected.

It is also an object ofthe invention to provide a simply constructedheater of this character which may be inexpensively manufactured ofsheet metal, the parts being so arranged that the unit may be installedwithout material alterations in the parts with which it is to beassociated.

A further object relates to provision of means for removing the soot-andthe like from the interior of the heating unit.

Other less important objects will become apparent as the descriptionproceeds, in which it will also be seen that the invention consists ofcertain novel features of construction, combination and arrangement ofparts which are particularly shown in the drawings to which detailedreference will be hereinafter made.

In the drawings:

Figure 1 represents a vertical sectional view of my improved heaterunit, said section being taken substantially on the plane of the line 11of Fig. 2.

Fig. 2 is a horizontal section of the heater shown in the foregoingfigure, the section being on the plane of the line 22 of Fig. 1.

Fig. 3 is a vertical sectional view of a modification of the invention.

The essential characteristics of the inven heat laden gases from thefurnace or stove being directed into the inner casing at one side andled therefrom from the other side and 1I1t0the chimney; a cleanoutpassageway opens through the walls of the inner and outer casings sothat soot and other deposlts may be removed from the inner casing. Fromthe several figures of the drawing it will be evident that variouschanges may be made in the application of the invention withoutdeparting from anyof the principles thereof.

Referring particularly to the structure illustrated in Figs. 1 and 2, 1represents a heating unit for connection with medium draft furnaces andthe like, it will be seen that the outer casing 1 is in the form of asubstantially rectangular box which is preferably formed of sheet metal,and that the same has a central opening in each of its vertical walls,said openings being designated respectively by the numerals 2, 3, 4 and5'. The inner casing 2 is also in the form of a rectangular sheet metalbox and it is disposed within the outer casing 1, its sides being suchthat its walls are spaced from the walls of the outer casing to providean air space between the two casings.

An inlet pipe 6 extends through the opening 2 and has its inner endconnected with the adjacent wall of the inner casing 2' forcommunication therewith. This inlet pipe is designed to be connectedwith the stove or furnace pipe as the case may be. An

' outlet pipe 7 of similar construction extends through the opening 3and has its inner end in communication with the interior of the innercasing 2', said end being secured to the wall of the latter. The damper8 of ordinary design is located in the outlet pipe 7 to control thepassage of heated gases to the chimney with which it is directly orindirectly connected.

The air to be heated by the hot gases passing into the inner casing 2 isdirected into the outer casing through an inlet pipe 9 secured in theopening 42 and after such air is heated it is led from the outer casingthrough the opening 5 with which an outlet pipe 10 tubes of one rowbeing staggered with respect to those of the other.

Inasmuch as the hot gases passing through the inner casing contain moreor less sootand the like, I provide means for readily cleaning the sameperiodically. The preferred arrangement includes one or more passageways12 which bridge the space between the walls of the inner and outer casings and are in communication with the former adjacent its bottom asshown in Fig. 1. Removable sliding covers 13 normally keep thepassageways 12 closed to prevent the escape of the hot gases.

The form of the invention illustrated in Fig. 3 is quite similar to thetype shown in Figs. 1 and 2, but is adapted for use in connection withheavy draft furnaces and stoves. The inner and outer casings, the inletand outlet pipes for both of these casings, and the cleanout passagewaysare all substantially the same as set forth with respect to the otherform. The air tubes which extend through the inner casing 52 are quitedifferent from the tubes 11, however, they being rectangular in crosssection and quite narrow in thickness as indicated at 11. It will benoted that these tubes 11 are arranged in three horizontal rows, themiddle row being substantially in the plane of the longitudinal axis ofthe inlet and outlet pipes 6' and 7 respectively, the other two rowshave their tubes so arranged that the passage of hot gases isconsiderably retarded in its movement within the inner casing.

- From the foregoing description and the several figures of the drawingsit will be evident that I have devised a very simply constructed andeconomical supplemental heater which is capable of use with varioustypes of furnaces and stoves, furthermore that the modification of theinvention may be readily used with heating apparatus which has alreadybeen installed as well as that which is yet to be placed in operation.

I claim:

1. A heating unit comprising an outer casing, an inner casing thereinand spaced from the walls thereof, a plurality of parallel rows of openended fluid passageways disposed in the inner casing, their oppositeends being secured in the opposite sides of the inner casing tocommunicate with the space between the casings, the correspondingpassageways of the several rows also forming parallel rows'disposed inplanes at right angles to the planes of the first mentioned rows, aninlet pipe extending through the outer casing and communicating with theinner casing, an outlet pipe from the inner casing and extending throughthe outer casing, said pipes being adapted to convey hot gases throughthe inner casing, a fluid inlet into the outer casing, and a fluidoutlet from the outer casing.

2. A heating unit comprising an outer casing, an inner casing thereinand spaced from thewalls thereof, a plurality of parallel rows of openended fluid passageways disposed in the inner casing, their oppositeends being secured in the opposite sides of the latter to communicatewith the space between the inner and outer casings, the passageways ofone row being staggered with respect to the passageways of the nextadjacent rows, whereby to impede the passage of fluid through the innercasing, an inlet pipe extending through the outer casing andcommunicating with the inner casing, an outlet pipe from the innercasing and extending through the outer casing, saidpipes being adaptedto convey hot gases through the inner casing, a fluid inlet into theouter casing, and a fluid outlet from the outer casing.

In testimony that I claim the foregoing I have hereunto set my hand atManitowoc in the county of Manitowoc and State of isconsin.

EDWARD SIEYART.

